Apparatus for grinding and polishing precious stones



APPARATUS FOR GRINDING AND POLISHING PRECIOUS STONES Filed April 23. 1929 Figi. Fig-2,.

@WWMM Patented Dec. 29, 1931 UNITI-:D STATES PAT i? orifice l EnNEsTLoEssER AND ERNEST vv. LoEssEE,` OE Merise, NEW YORK, ASSIGNORS, :BY f@ MEsNE ASSIGNMENTS; To NEWDIAMOND PoLI'sHING TOOL COMPANY OE AMERICA,

INC.

APPARATUS Eon GEINDING AND PoL'fsHING :Pensions STONES y Application inea epm 23,

This invention relates essentially to an apparatus for grinding and polishingprecious stones especially such as diamonds, and which includes a dop for holding the stone which is readily removable from an arc shaped oscillating carrier adaptedV for mounting the dop.

An object of the invention is to provide the dop with devices whereby it is connected 1'0 to the carrier and can easily be reset to a different axial position relative to the carrier so as to position the top or table and the successive facets of the diamondV onto a revolvf ing lap or polishing wheel.

Another object of the invention is to provide a bifurcated foot member engaging the periphery of the dop for forcing it up into a socket formed in a notched disk fixed to the lower part of the carrier.

Another' Object of the invention is to provide the upper portion of the dop with a clamp having a projecting stud or detent made to engage any one of the notches so as to securely fasten the dop thereby prevent- 25 ing rotary movement in its association with the carrier.

The invention resides more particularly in the novel combinations hereinafter described and claimed, reference being made to the ac- 30 companying drawings in which:

Fig. 1 represents a side elevation of van apparatus embodying this invention.

Fig. 2 is a vertical section taken along the line 2 2 of Fig. 1.

Fig. 3 is a horizontal section taken along the line 3--3 of Fig. l.

Fig. l is a side elevation of the dop.

In the drawings the numeral 5 designates a segmental arc member having a tongue 6 and a shaft 7 extending upwardly from the top of the arc member. The shaft has s sleeve or boss 8 fixed to it by means of a nut 9 engaging an upper threaded end of ther f shaft. The shaft and its sleeve is arranged in the bore of a bearing 1() located at the fre-e end of a frame or arm 11 suitable for supporting the apparatus on a table as is well known. The set screw 12 secures the sleeve 501 and shaft in the bore but when the screw 1,929; seriali No. 357,428.

loosened the shaft and its sleeve can be slid up .and down in the bore.

Below the segment V5` is arranged a carrier 13 having a curved groove 14, engaging the tongue of the segment. In. thisarrangement the carrier can lbe `moved `or vibrated in an arc of a 'circle whilethe segmental member 5 remains stationary. At thelower end of the carrier Vis'positioneda notched disk 15` having a stem l'exten'ding into ahole in thc carrier-and the disk is fastened tothe car-` rier means of a screw-17 threaded in the side of `the carrier. Adop 18 is Vprovided with a Vshort stem or cylindrical head or hub 19 at its upper end so that it can be slid into a. shallow socket located infthe` notched disk asvindicated in Fig. 2. On the upper rim of the doo is arranged'a clamp consisting of a split band or ring 20 having ears 21 made to coact with a screw 22 for fasteningr the ring to the frame. The ring has Van upwardly projecting stud 24 made toengage onefof the notches when the dop is in place: In Order to prevent downward movement of the dop a bifurcated foot 25 is provided. v This foot has a bar orstem 26 extending` upward ly into a bearing 27 depending from' the lowerpart of the carrier and a. bolt 28v when. adjusted by a nut 29, will jam thebar against the bearing or loosen it topermit it to slidel in, said'bearing. i

A diamond 430 or other precious stone is fixed in arecess situated in the lower end of" the dop and when itv is desired'to `grind or polish a facet 'thereof the carrier is moved in an arc to `position any one of the facets` onto a revolving lap 31 as is well-known. In this` device when it is desired to move a successive facet into engagement with the lap, the forked foot is slidl down and the cylindrical head of the dop moves downward from the socket thereby disengaging the stud from the notch.v The dop can thus be rotatedand the stud pushed into the next notch. The numbered degree marks on the band denote the distance the dop `should be turned about its axis to move the successive facets onto the lap.. Likewise the numbered degree inscrip* tions on the segmental tongue member de note the angle at whichthe carrier is set.` By WU having the forked foot engage the periphery of the dop it does not interfere with the stone in its operative movement with the lap.

We claim l. A grinding and polishing apparatus comprising aframe having a bearing, a segmental arc member having a stem secured in the bearing, a carrier slidingly coacting with the arc member, a notched disk adjustably secured to the carrier, a dop having a stud whereby it is fitted to the notched disk to prevent rotary movement thereof, and a bifurcated foot engaging the dop member and movably fixed to the carrier, said foot maintaining the dop stud engaged with the notched disk.

2. A grinding and polishing apparatus comprising a frame having a bearing, a segmental arc member having a stem secured in the bearing, a carrier slidingly coacting with the arc member, a notched disk having a socket secured to the lower part of the carrier, a dop with a head engaging the socket, said dop having a stud fixed to it whereby it is litted to the notched disk to prevent rotary movement thereof, and a bifurcated foot connected to the carrier and engaging the periphery of the dop, to maintain the dop head seated in the socket in said disk.

3. A grinding and polishing apparatus comprising a frame having a bearing, a segmental arc member having a stem secured in the bearing, a carrier slidingly coacting with the arc member, a notched disk having a socket secured to the lower part of the carrier, a dop with a head engaging the socket, a split clamping ring secured to the upper part of the dop, said ring having a stud projecting upwardly to engage one of the notches, and a bifurcated foot engaging the periphery of the dop whereby the head thereof is held into engagement with its socket, said foothaving a bar movably fitted in a lower 5 part of the carrier.

4. A grinding and polishing apparatus comprising a frame having a bearing provided with a. bore, a segmental arc member having a shaft movably fitted in the bore, means for fastening the shaft in the bore, a carrier slidingly connected to the arc member, a notched disk having a socket fixed t-o the carrier centrally with its axis, a dopwith a cylindrical head adapted for engagement with the socket, a split band having a stud for for engagement with one of the notches, and a bar adjustably connected to the carrier, said bar having a bifurcated foot member made to engage the periphery of the dop so as to prevent it fro-1n dropping from the socket.

5. A grinding and polishing apparatus comprising a carrier, a notched disk detachably secured to said carrier and provided with a socket, a dop having a head engaging the socket, a split clamping ring secured to the upper part of the dop, said ring having a stud projecting upwardly to engage one of the notches, and a bifurcated foot engaging the periphery of the dop whereby the head thereof is held into engagement with its socket, said foot having a bar movably fitted in a lower part of the carrier.

6. A grinding and polishing apparatus comprising a carrier, a notched disk having a socket fixed to the Carrier centrally with its axis, a. dop with a cylindrical head adapted for engagement with the socket, a split band having a stud for engagement with one of the notches, and a bar adjustably connected to the carrier, said bar having a bifurcated foot member made to engage the periphery of the dop so as to preyent it fro-m dropping from the socket.

In testimony whereof we have hereunto set our hands.

ERNEST LOESSER. ERNEST W. LOESSER. 

